package com.itheima.fanxing5;

import java.util.ArrayList;

public class Demo01 {

    public static void main(String[] args) {
        ArrayList<String> list = new ArrayList<>();
        ArrayList<Integer> list2 = new ArrayList<>();
        sing(list);
        sing(list2);

    }

    public static void sing(ArrayList<?> list){
        System.out.println(list);
    }
}
